import os
import sys
import shutil
from typing import List

from django.core.management.base import AppCommand
from django.core.management.color import color_style

from django_extensions.management.utils import _make_writeable, signalcommand


class Command(AppCommand):
    help = "Creates a Django jobs command directory structure for the given app name "
    "in the current directory."

    requires_system_checks: List[str] = []
    # Can't import settings during this command, because they haven't
    # necessarily been created.
    can_import_settings = True

    @signalcommand
    def handle_app_config(self, app, **options):
        copy_template("jobs_template", app.path, **options)


def copy_template(template_name, copy_to, **options):
    """Copy the specified template directory to the copy_to location"""
    import django_extensions

    style = color_style()
    ERROR = getattr(style, "ERROR", lambda x: x)
    SUCCESS = getattr(style, "SUCCESS", lambda x: x)

    template_dir = os.path.join(django_extensions.__path__[0], "conf", template_name)
    verbosity = options["verbosity"]

    # walks the template structure and copies it
    for d, subdirs, files in os.walk(template_dir):
        relative_dir = d[len(template_dir) + 1 :]
        if relative_dir and not os.path.exists(os.path.join(copy_to, relative_dir)):
            os.mkdir(os.path.join(copy_to, relative_dir))
        for i, subdir in enumerate(subdirs):
            if subdir.startswith("."):
                del subdirs[i]
        for f in files:
            if f.endswith(".pyc") or f.startswith(".DS_Store"):
                continue
            path_old = os.path.join(d, f)
            path_new = os.path.join(copy_to, relative_dir, f).rstrip(".tmpl")
            if os.path.exists(path_new):
                if verbosity > 1:
                    print(ERROR("%s already exists" % path_new))
                continue
            if verbosity > 1:
                print(SUCCESS("%s" % path_new))

            with open(path_old, "r") as fp_orig:
                with open(path_new, "w") as fp_new:
                    fp_new.write(fp_orig.read())

            try:
                shutil.copymode(path_old, path_new)
                _make_writeable(path_new)
            except OSError:
                sys.stderr.write(
                    "Notice: Couldn't set permission bits on %s. You're probably using an uncommon filesystem setup. No problem.\n"  # noqa: E501
                    % path_new
                )
